/* Copyright (c) 2021 Xie Meiyi(xiemeiyi@hust.edu.cn) and OceanBase and/or its affiliates. All rights reserved.
miniob is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:
         http://license.coscl.org.cn/MulanPSL2
THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details. */

//
// Created by Wangyunlai on 2022/6/5.
//

#pragma once

#include <vector>

#include "rc.h"
#include "sql/stmt/stmt.h"
#include "storage/common/field.h"

class FieldMeta;
class FilterStmt;
class Db;
class Table;

class SelectStmt : public Stmt
{
public:

  SelectStmt() = default;
  ~SelectStmt() override;

  StmtType type() const override { return StmtType::SELECT; }
public:
  static RC create(Db *db, const Selects &select_sql, Stmt *&stmt);

public:
  const std::vector<Table *> &tables() const { return tables_; }
  const std::vector<Field> &query_fields() const { return query_fields_; }
  FilterStmt *filter_stmt() const { return filter_stmt_; }
  RelAttr get_aggr_attribute(int idx) const { return attributes_[idx]; }
  int aggr_attribute_num() { return aggr_attribute_num_; }
  int order_condition_num() { return order_condition_num_; }
  int group_condition_num() { return group_condition_num_; }
  RelAttr *attributes() { return attributes_; }
  OrderCondition *get_order_conditions() { return order_conditions_; }
  GroupCondition *get_group_conditions() { return group_conditions_; }

private:
  std::vector<Field> query_fields_;
  std::vector<Table *> tables_;
  FilterStmt *filter_stmt_ = nullptr;
  RelAttr attributes_[MAX_NUM];
  int aggr_attribute_num_ = 0;
  OrderCondition order_conditions_[MAX_NUM];
  int order_condition_num_ = 0;
  GroupCondition group_conditions_[MAX_NUM];
  int group_condition_num_ = 0;
};

